i can't unblock or unmute my friend

This looks like a dupe of MCPE-165603

they would not fix it!!!

when i go out after i turned mute and block when i go back i realize it did not work!!

As explained in the Bug Tracker Guidelines, which you are advised to read when creating your account, "Resolved" does not mean Fixed.
In this case, we are tracking this issue in MCPE-165603, so this ticket is being resolved and linked as a duplicate.

If you would like to add a vote and any extra information to the main ticket it would be appreciated.

If you haven't already, you might like to make use of the search feature to see if the issue has already been mentioned.

Quick Links:
📓 Bug Tracker Guidelines – 💬 Community Support – 📧 Mojang Support
📓 Project Summary – ✍️ Feedback and Suggestions – 📖 Game Wiki

i see.